Births with the level set once, on a survey nobody had opened

The births voice, tuned on women's records from 2011-2013 and frozen, was asked about 4,528 women in a survey wave nobody here had opened. It ranked who would have a baby in the next three years well ahead of age alone (AUC 0.699 against 0.622) and slightly ahead of a regression on the same facts (0.685). The earlier test adjusted the level twice for the same fall in births; here it is set once, from age and the national birth rate at each woman's own age, and the voice moves each woman above or below it. Predicted share 0.224 against the observed 0.234 (95% interval 0.222 to 0.246): inside. The earlier rule would have given 0.217, outside. Registered before the data was read; scored once.